An additional yaw moment is exerted under propeller pitch zero ope 【 ation during coasting maneuver of CPP ships , which introduces a significant reduction in maneuverability . In order to improve the maneuverabi ] lty of CPP ships at じoasting , the authors propose the use of Minimurn Ahead Pitch (MHP) of CPP M } IP is the smallest blade angle ofCPP at fbrward pitch which ensures adequate steerage . Using a 5, 884 GTL training ship with a s量 ngle CPP , singie flap rudder and bow thruster , 飢 1 − scale experiments were conducted te confirm the effect { veness ofMHP operation in coast 量 ng maneuver and to investigate its optimal application fbr anchoring and undocking . The results led to the following conclusions : (1) CPP ships 皿 der coasting using M } { P are controllable by steering , making it possible to keep the planned course . (2) Transverse moving maneuver fbr undocking becomes possible by the use ofMHP w 重 th a high − lift rudder and bow thruster . (3) For ships with a single − CPP and single − rudder , MHP operation improves the maneuverability in coasting , anchoring and undocking .
The authors have carried out wind tunnel experiments on a 1 / 75 scale model of the sail training ship NIPPON MARU at Osaka University. The experi 皿 ents consisted of two parts , one is How visualization arollnd wind speed vanes located
The NIPPON MARU ,2570 ton 4−masted bark, was bullt in 1984 to replace for皿 er NIPPON MARU as a sa 三 l training ship for the cadets of Institute for Sea Training , Ministry of T エ anspor ち Japan,
For master , it is important to know the stopping ability of the ship and control method of the ship ' s motion caused by propeller reversing operation both under calm and windy conditions . Stopping tests are carried out
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